proposition the law of density is the same asthe law of thickness of a very thin material shell bounded bytwo similar and similarly situated spheroids. Let AA be the major axis of generating ellipse, and P, 1 Pi-o-normal ,to the Pj be the thickness of the shellat the point P, then PP,duced is… … PF Again PP, = P,q cos PP^Q = P^Q cos GPN= P,Q. ^^ P,M = ^,{a- CM). where a, V = the semi-major and minor axes of outer ellipse,and On subtracting, smce -2 = -^, Ur IXi P^W - QM = ^, (a - a) = b - b; .: P,Q {P,M+ QM) = {h + h) {b-b);.■.PN.PQ = b(b-h),remembering that the shell is indefinitely thin.…
Electricity
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